Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / crypto / crypto_null.c

diff --git a/kernel/crypto/crypto_null.c b/kernel/crypto/crypto_null.c
new file mode 100644 (file)
index 0000000..a203191
--- /dev/null
+++ b/kernel/crypto/crypto_null.c
@@ -0,0 +1,182 @@
+/*
+ * Cryptographic API.
+ *
+ * Null algorithms, aka Much Ado About Nothing.
+ *
+ * These are needed for IPsec, and may be useful in general for
+ * testing & debugging.
+ *
+ * The null cipher is compliant with RFC2410.
+ *
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <crypto/null.h>
+#include <crypto/internal/hash.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+
+static int null_compress(struct crypto_tfm *tfm, const u8 *src,
+                        unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+       if (slen > *dlen)
+               return -EINVAL;
+       memcpy(dst, src, slen);
+       *dlen = slen;
+       return 0;
+}
+
+static int null_init(struct shash_desc *desc)
+{
+       return 0;
+}
+
+static int null_update(struct shash_desc *desc, const u8 *data,
+                      unsigned int len)
+{
+       return 0;
+}
+
+static int null_final(struct shash_desc *desc, u8 *out)
+{
+       return 0;
+}
+
+static int null_digest(struct shash_desc *desc, const u8 *data,
+                      unsigned int len, u8 *out)
+{
+       return 0;
+}
+
+static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key,
+                           unsigned int keylen)
+{ return 0; }
+
+static int null_setkey(struct crypto_tfm *tfm, const u8 *key,
+                      unsigned int keylen)
+{ return 0; }
+
+static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+       memcpy(dst, src, NULL_BLOCK_SIZE);
+}
+
+static int skcipher_null_crypt(struct blkcipher_desc *desc,
+                              struct scatterlist *dst,
+                              struct scatterlist *src, unsigned int nbytes)
+{
+       struct blkcipher_walk walk;
+       int err;
+
+       blkcipher_walk_init(&walk, dst, src, nbytes);
+       err = blkcipher_walk_virt(desc, &walk);
+
+       while (walk.nbytes) {
+               if (walk.src.virt.addr != walk.dst.virt.addr)
+                       memcpy(walk.dst.virt.addr, walk.src.virt.addr,
+                              walk.nbytes);
+               err = blkcipher_walk_done(desc, &walk, 0);
+       }
+
+       return err;
+}
+
+static struct shash_alg digest_null = {
+       .digestsize             =       NULL_DIGEST_SIZE,
+       .setkey                 =       null_hash_setkey,
+       .init                   =       null_init,
+       .update                 =       null_update,
+       .finup                  =       null_digest,
+       .digest                 =       null_digest,
+       .final                  =       null_final,
+       .base                   =       {
+               .cra_name               =       "digest_null",
+               .cra_flags              =       CRYPTO_ALG_TYPE_SHASH,
+               .cra_blocksize          =       NULL_BLOCK_SIZE,
+               .cra_module             =       THIS_MODULE,
+       }
+};
+
+static struct crypto_alg null_algs[3] = { {
+       .cra_name               =       "cipher_null",
+       .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
+       .cra_blocksize          =       NULL_BLOCK_SIZE,
+       .cra_ctxsize            =       0,
+       .cra_module             =       THIS_MODULE,
+       .cra_u                  =       { .cipher = {
+       .cia_min_keysize        =       NULL_KEY_SIZE,
+       .cia_max_keysize        =       NULL_KEY_SIZE,
+       .cia_setkey             =       null_setkey,
+       .cia_encrypt            =       null_crypt,
+       .cia_decrypt            =       null_crypt } }
+}, {
+       .cra_name               =       "ecb(cipher_null)",
+       .cra_driver_name        =       "ecb-cipher_null",
+       .cra_priority           =       100,
+       .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
+       .cra_blocksize          =       NULL_BLOCK_SIZE,
+       .cra_type               =       &crypto_blkcipher_type,
+       .cra_ctxsize            =       0,
+       .cra_module             =       THIS_MODULE,
+       .cra_u                  =       { .blkcipher = {
+       .min_keysize            =       NULL_KEY_SIZE,
+       .max_keysize            =       NULL_KEY_SIZE,
+       .ivsize                 =       NULL_IV_SIZE,
+       .setkey                 =       null_setkey,
+       .encrypt                =       skcipher_null_crypt,
+       .decrypt                =       skcipher_null_crypt } }
+}, {
+       .cra_name               =       "compress_null",
+       .cra_flags              =       CRYPTO_ALG_TYPE_COMPRESS,
+       .cra_blocksize          =       NULL_BLOCK_SIZE,
+       .cra_ctxsize            =       0,
+       .cra_module             =       THIS_MODULE,
+       .cra_u                  =       { .compress = {
+       .coa_compress           =       null_compress,
+       .coa_decompress         =       null_compress } }
+} };
+
+MODULE_ALIAS_CRYPTO("compress_null");
+MODULE_ALIAS_CRYPTO("digest_null");
+MODULE_ALIAS_CRYPTO("cipher_null");
+
+static int __init crypto_null_mod_init(void)
+{
+       int ret = 0;
+
+       ret = crypto_register_algs(null_algs, ARRAY_SIZE(null_algs));
+       if (ret < 0)
+               goto out;
+
+       ret = crypto_register_shash(&digest_null);
+       if (ret < 0)
+               goto out_unregister_algs;
+
+       return 0;
+
+out_unregister_algs:
+       crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
+out:
+       return ret;
+}
+
+static void __exit crypto_null_mod_fini(void)
+{
+       crypto_unregister_shash(&digest_null);
+       crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
+}
+
+module_init(crypto_null_mod_init);
+module_exit(crypto_null_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Null Cryptographic Algorithms");